<?php
/**
* Copyright 2014 Facebook, Inc.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to
* use, copy, modify, and distribute this software in source code or binary
* form for use in connection with the web services and APIs provided by
* Facebook.
*
* As with any software that integrates with the Facebook platform, your use
* of this software is subject to the Facebook Developer Principles and
* Policies [http://developers.facebook.com/policy/]. This copyright notice
* shall be included in all copies or substantial portions of the software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
/**
* You only need this file if you are not using composer.
* Why are you not using composer?
* https://getcomposer.org/
*/
if (version_compare(PHP_VERSION, '5.4.0', '<')) {
	throw new Exception('The Facebook SDK v4 requires PHP version 5.4 or higher.');
}
/**
* Register the autoloader for the Facebook SDK classes.
* Based off the official PSR-4 autoloader example found here:
* https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
*
* @param string $class The fully-qualified class name.
* @return void
*/
spl_autoload_register(function ($class)
{
	// project-specific namespace prefix
	$prefix = 'Facebook\\';
	// base directory for the namespace prefix
	$base_dir = defined('FACEBOOK_SDK_V4_SRC_DIR') ? FACEBOOK_SDK_V4_SRC_DIR : __DIR__ . '/Facebook/';
	// does the class use the namespace prefix?
	$len = strlen($prefix);
	if (strncmp($prefix, $class, $len) !== 0) {
	// no, move to the next registered autoloader
		return;
	}
	// get the relative class name
	$relative_class = substr($class, $len);
	// replace the namespace prefix with the base directory, replace namespace
	// separators with directory separators in the relative class name, append
	// with .php
	$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
	// if the file exists, require it
	if (file_exists($file)) {
		require $file;
	}
});